Locomotive-boiler.



UNTTED sTATEs PATENT oEEioE.

GEORGE COOK, OF ELBA, NEW YORK.

LOCOMOTIVE-BOILER.

To all whom it may concern:

Be it known that I, GEORGE COOK, a citizen of the United States, residing at Elba, in the county of Genesee and State of New York, have invented certain new and useful Improvements in Locomotive- Boilers, of which the following` is a specification.

My invention relates to steam boilers for locomotive engines and its general object is to generally improve their construction and operation.

A special object of my invention is to facilitate the assemblage of the parts of such boilers and their disassembling for purposes of replacement or repair.

A further object of my invention is to afford an improved and increased circulation in such boilers. f l

A further object is to increase the capacity of such boilers without materially increasing their outside dimensions.

With these objects in view my invention consists in the improved construction, arrangement and combination of parts hereinafter fully described and afterward specifically claimed. I i

In order to enable others skilled in the art to which my invention most nearly appertains to make and use the same, I willV now proceed to fully describe a boiler of the class mentioned, which contains one embodiment of my invention, in connection with the accompanying drawing, in which- Figure 1 is a longitudinal vertical section, Fig. 2 is a transverse vertical section on an enlarged scale taken on the line 2 2 of Fig. 1. Fig. 3 is a similar section, also on an enlarged scale, taken on the line 3 3 of Fig. 1, and Figs. 4 and 5 are sectional detail views of permissible modification in the construction of the boiler.

Like reference characters mark the same parts wherever theyl occur in the several figures of the drawing.

Referring specifically to the drawing 6 indicates the ire boX which may be of any suitable or approved construction the upper or crown sheet thereof being shown at 7. The usual smoke flues 8 are provided through which the gases of combustion pass in the usual manner into and through an inner casing 9 and into and through the smokebox 10 and smoke stack 11. The casing 9 is square in transverse section, the corners being sli htly rounded, the shell being formed o two sheets lapped at diagonally Specicaton of Letters Patent.

Application led May 9, 1907.

Patented Oct. 12, 1909. seriaiNo. 372,680.

opposite corners, as at 12, and riveted together, or, 1t Ymay be, secured, with a packing vbetween them, lby bolts or in any suitable will be slightly inclined instead of exactly horizontal.

15 indicates the steam drum of any usual or approved construction, located as is usual, in communication with the steam space 16 of the boiler and preferably provided with a removable cap 17, so that easy access to the interior of the drum, and to the steam space of the boiler is afforded.

In order that the square tube casing 9 may be slightly larger than usual and thus afford correspondingly greater steaming capacity, I do not make the boiler shell of tlnJ usual circular transverse section, but make the curves of the sides of a greater radius so that they are apparently flattened, as at 1S in Fig. 2, there consequently appearing arcular corners 19 at the junction of such. curves as clearly shown.A This form more nearly approaches the square transverse form of the tube casing 9 and permits of the use, in a boiler shell of a given transverse sectional area, of a slightly larger square tube casing 9, thus increasing the length of the tubes 13 and 14 and correspondingly increasing the capacity of the boiler. This form of boiler shell is improved by bracing as at 20, 21, as clearly shown.

There being a circulation in the vertical tubes 13 and as a consequence a discharge of water and steam from their top ends, it is desirable to prevent such water and wet steam from entering the steam drum, which should contain only dry steam. In order to accomplish this result, I secure a baille plate 22 to the braces 20, 21, immediately under the steam drum, upon which the upwardly discharged steam and water will strike and drop back, being prevented from entering the steam drum.

In order that the parts may be readily assembled or taken apart, I arrange the tube casing 9 so that it can be readily passed into the front end of the boiler shell, and to hold ,it therein, I form an outwardly projecting .Hange 23 on its inner end, inside ot' which is Ila groove Q4, so that the flange 28 does not 'project beyond the periphery of the tube casing. The casing can thus be readily passed int-o the shell until the flange 23 abuts against the rear plate 25 of .the fire box, to which it may be secured by rivets or bolts, the heads of these being seated in the groove 24 and being entirely out of the way in passing. in or removing the tube casing.

At the front end of the tube casing may be formed a flange, as at 26 which, when the tube casing is fully within the boiler shell, will abut against the plate 27 and may be secured thereto by rivets or bolts in any usual manner.

Modified forms of joints may be used to secure the tube casing in the shell, a joint for the trent end being shown in Fig. t and a joint for the rear end in Fig. 5. The construction of these joints will be readily understood by those skilled in the art and a. detailed description is not deemed necessary.

While I have specically described the construction and arrangement of the various parts of the boiler, I do not wish to confine myself to suoli exact constructions, as it will be readily understood thatmany modifications thereof, or variations therefrom, may be made without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim as new is l. A boiler shell, having its sides transversely curved and connected by transversely curred corners, each side being` curved on a radius greater than that of a circle eircumscribed about the shell and touching the corners and the radius of each corner being not greater than that ot` said circle, in com bination with an inserted tube casing square in cross section. with its sides, top and bottom lying within the corresponding portions of the shell, substantially as described.

2. In combination, a boiler' shell, a steam drum, a tube casing in the shell, water tubes in the casing` opening oppositethe steam drum, and a baille plate in front of the discharge end ot said tubes and between said discharge ends and the steam drum, substantially as described.

3. In combination, a boiler shell, a tube casing therein, water tubes in the casing, a steam drum opposite the discharge ends of said tubes, tansverse braces in the boiler shell adjacent to the steam drum, and av batie plate of less width than the length ot said braces secured on said braces between the steam drumand the discharge ends ot the water tubes leaving openings at the ends and sides of the balile plate tor passage ot' steam to the drum, substantially as described.

In testimony whereof I aHix my signature in presence of two witnesses.

GEORGE COOK. lVitnesses S. BRAsHEARs, GEORGE H. LUsooMn. 

